1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 /* 33 * This set of routines used to be implemented mostly in assembler. 34 * 35 * Since the purpose they have is now rather vestigial, and 64-bit 36 * machines can do operations on 64-bit quantities pretty efficiently, 37 * a C implementation seems quite adequate and much more maintainable. 38 */ 39 40 #include "lint.h" 41 #include <sys/types.h> 42 #include <sys/dl.h> 43 44 typedef union { 45 long xword; 46 dl_t dl; 47 } dlx_t; 48 49 dl_t 50 ladd(dl_t lop, dl_t rop) 51 { 52 dlx_t r; 53 /* LINTED pointer cast may result in improper alignment */ 54 r.xword = *(long *)&lop + *(long *)&rop; 55 return (r.dl); 56 } 57 58 dl_t 59 lshiftl(dl_t op, int cnt) 60 { 61 dlx_t r; 62 if (cnt < 0) 63 /* LINTED pointer cast may result in improper alignment */ 64 r.xword = (long)(*(ulong_t *)&op >> (-cnt)); 65 else 66 /* LINTED pointer cast may result in improper alignment */ 67 r.xword = *(long *)&op << cnt; 68 return (r.dl); 69 } 70 71 int 72 lsign(dl_t op) 73 { 74 /* LINTED pointer cast may result in improper alignment */ 75 return ((*(long *)&op) >> 63); 76 } 77 78 dl_t 79 lsub(dl_t lop, dl_t rop) 80 { 81 dlx_t r; 82 /* LINTED pointer cast may result in improper alignment */ 83 r.xword = *(long *)&lop - *(long *)&rop; 84 return (r.dl); 85 } 86 87 dl_t 88 lmul(dl_t lop, dl_t rop) 89 { 90 dlx_t r; 91 /* LINTED pointer cast may result in improper alignment */ 92 r.xword = *(long *)&lop * *(long *)&rop; 93 return (r.dl); 94 } 95